US3820446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means at pressure fluid cylinders
Assignee: Origa Cylindrar AB
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Filing: 1971-12-20
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Granted: 1974-06-28
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Expires: 1991-12-20
Abstract
Abstract A pressure fluid cylinder having a slot extending longitudinally along the wall thereof and a piston provided with a projection extending through said slot and slidable with said piston. The slot being sealed by a sealing member along and attracted to the inside of said cylinder to seal the slot beyond the ends of the piston, said piston being interconnected to the sealing member so as to draw the member away from the slot between the ends of the piston as the piston is moved in the cylinder.
Inventors
- 👤 B Granbom
- 👤 K Lundqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:36
CPC Classifications
F; F03; F03C; F03C1/00; F01; F01B; F01B17/00; F01B17/02; F15; F15B; F15B15/00; F15B15/08; F15B15/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
A cylinder and piston construction comprising a cylinder of non-magnetic material having a slot extending longitudinally along the wall thereof, a piston provided with a guide channel therethrough, slidably mounted within said cylinder, a projection element attached to and movable with said piston and extending through the slot of said cylinder, a flexible strip sealing member having magnetic properties attached at its respective ends to said cylinder and extending longitudinally of the slot along the inside wall of said cylinder and in overlapping relation with the border portions of the slot for closing the slot on both sides of said projection and extending through the guide channel in said piston, and at least one magnet element disposed in the wall of said cylinder adjacent at least one side of the slot for attracting said sealing strip member against the slot, whereby the guide channel in said piston, as said piston moves in said cylinder, will withdraw said sealing strip from the slot to permit said projection to move therealong and will return said sealing strip member to said slot to close said slot, substantially all of those portions of said sealing strip lying on both sides of the guide channel being uniformly and sealingly attracted along their lengths by said at least one magnet element in the wall of said cylinder.
Claim 2
Dependent Claim
221 words
A cylinder and piston construction comprising a cylinder of non-magnetic material having a slot extending longitudinally along the wall thereof, a piston provided with a guide channel therethrough, slidably mounted within said cylinder, a projection element attached to and movable with said piston and extending through the slot of said cylinder, a flexible strip sealing member having magnetic properties attached at its respective ends to said cylinder and extending longitudinally of the slot along the inside wall of said cylinder and in overlapping relation with the border portions of the slot for closing the slot on both sides of said projection and extending through the guide channel in said piston, and at least one magnet element disposed in the wall of said cylinder adjacent at least one side of the slot for attracting said sealing strip member against the slot, whereby the guide channel in said piston, as said piston moves in said cylinder, will withdraw said sealing strip from the slot to permit said projection to move therealong and will return said sealing strip member to said slot to close said slot, substantially all of those portions of said sealing strip lying on both sides of the guide channel being uniformly and sealingly attracted along their lengths by said at least one magnet element in the wall of said cylinder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |